package udp;

import java.io.IOException;
import java.net.*;
import java.util.Scanner;

public class UdpEchoClient {
    private DatagramSocket socket=null;
    private String serverIp;
    private int serverPort;

    public UdpEchoClient(String serverIP,int serverPort) throws SocketException {
        this.serverIp=serverIP;
        this.serverPort=serverPort;
        socket=new DatagramSocket();
    }

    public void start() throws IOException {
        Scanner scanner=new Scanner(System.in);
        while (true){
            if (!scanner.hasNext()){
                break;
            }
           String request=scanner.next();
            DatagramPacket requestPacket=new DatagramPacket(request.getBytes(),request.getBytes().length,
                    InetAddress.getByName(serverIp),serverPort);
            socket.send(requestPacket);

            DatagramPacket responsePacket=new DatagramPacket(new byte[4399],4399);
            socket.receive(responsePacket);
            String response=new String(responsePacket.getData(),0,responsePacket.getLength());
            System.out.println(response);
        }
    }

    public static void main(String[] args) throws IOException {
        UdpEchoClient client=new UdpEchoClient("127.0.0.1",9090);
        client.start();
    }

}
